Rybka 3 UCI is the world champion of chess engines with a rating 3150 points ELO. The main developer of the program - international master Vasik Rajlich ( Hungary ) has inserted the algorithms of positional estimation into it which are as close to the chess-player's style of thinking as possible.

Rybka 3 UCI is not a standalone program and works only in other popular interfaces e.g. Fritz, ChessBase 9, Shredder, Junior, Hiarcs, Chess Assistant.
You can find a database with 460 000 games (2005 - 2007 years) in PGN format (for ChessBase, Fritz) and a demo version of Rybka 3 Aquarium on this disk.

Besides, Rybka 3 UCI include free ChessOK playing zone with Rybka 3 program. Now it can help you not only play chess in Internet for free, but also analyze games played by you or grandmasters’ games broadcasted at ChessOK playing zone!